Abstract
Abstract Due to still increasing fish waste production, there is an effort to develop an effective and environmentally friendly treatment technology. Anaerobic fermentation of fish waste represents a promising way of its effective environmental material-energy recycling. The process flow diagram was designed for the biorefinery in which fish waste is anaerobically co-fermented with cow dung to produce methane and concentrated liquid mineral fertiliser being primary products, and carbon dioxide, solid fertiliser and purified water being secondary ones. Specific capital investment cost of such a plant is 659 Eur t−1 of the treated substrate. Techno-economic analysis of the proposal showed that its technical maturity is limited by TRL7 being both for operating set of mineral liquid production by reverse osmosis, and for operating set of biomethane separation using membranes. Sensitivity analysis found that the profitability of such a proposal is strongly dependent on methane yield and primarily on the methane purchase price. The technology is profitable only if methane yield over 0.34 L kg−1 VS of fish waste and methane purchase price over 0.17 Eur kWh−1 are reached. So if there is no green subsidy, the technology is not profitable.
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